Chrysler M318B - max rpm?

[TBarCYa]

I'm looking online for the specs but can't find anything conclusive. What's max RPM for a 1971 Chrysler 318? I was cruising at 1/2 throttle doing 22kts at anywhere from 4500-5000rpm. I'm thinking I need to go up in prop pitch, but need to know where it should be before buying a new prop.

Thanks.

 

[Bondo]

Ayuh,.... I ain't a Chrysler guy but I imagine they'll be comfortable at 4800 rpms with a 4bbl. carb, or 4600 rpms with a 2bbl...

Most All boat motors are cam'ed to that point,....